wondering if the reddish hue visible indicates potentially the rare and more valuable grado driver in these sr-100s? thanks for any insights.

i dig my musical paradise mp-301 amp. these days its dedicated to headphone duty. love the tube rolling capabilities of the amp. the sound of the amp is good - but could be better. does anyone have mods or upgrades to suggest? thanks for any input. regards -andre

greetings: i have the musical paradise mp-301 mk3. i love the tube rolling capabilities, and the size and operation, but feel like the sound could be improved. if anyone has experience or insights on modifications and improvements on the 301, please post. thanks!